mirror of
https://github.com/clearlinux/graphene.git
synced 2026-09-08 06:41:58 +00:00
Chia-Che Tsai
7f19f62f31
Plenty of bugfixes for Linux kernel later than 3.5 and Ubuntu later than 10.10. More organized code to improve portability. Regression tests for Pal to test completeness of implementation.
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
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/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
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#define _GNU_SOURCE
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#include <malloc.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <sched.h>
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <asm/prctl.h>
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// 64kB stack
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#define FIBER_STACK 1024 * 64
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__thread int mypid = 0;
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unsigned long gettls (void)
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{
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unsigned long tls;
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syscall(__NR_arch_prctl, ARCH_GET_FS, &tls);
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return tls;
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}
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int thread_function (void * argument)
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{
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mypid = getpid();
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int * ptr = (int *) argument;
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printf("in the child: pid (%016lx) = %d\n", (unsigned long) &mypid, mypid);
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printf("in the child: pid = %d\n", getpid());
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printf("in the child: tls = %08lx\n", gettls());
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printf("child thread exiting\n");
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printf("argument passed %d\n", *ptr);
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return 0;
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}
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int main (int argc, const char ** argv)
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{
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void * stack;
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pid_t pid;
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int varx = 143;
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mypid = getpid();
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printf("in the parent: pid = %d\n", getpid());
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// Allocate the stack
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stack = malloc(FIBER_STACK);
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if (stack == 0) {
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perror("malloc: could not allocate stack");
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_exit(1);
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}
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printf("child_stack: %016lx-%016lx\n", (unsigned long) stack,
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(unsigned long) stack + FIBER_STACK);
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// Call the clone system call to create the child thread
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pid = clone(&thread_function, (void *) stack + FIBER_STACK,
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CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_VM,
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&varx);
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printf("clone() creates new thread %d\n", pid);
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if (pid == -1) {
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perror("clone");
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_exit(2);
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}
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// Wait for the child thread to exit
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pid = waitpid(0, NULL, __WALL);
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if (pid == -1) {
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perror("waitpid");
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_exit(3);
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}
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// Free the stack
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free(stack);
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printf("in the parent: pid (%016lx) = %d\n", (unsigned long) &mypid, mypid);
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printf("in the parent: pid = %d\n", getpid());
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printf("in the parent: tls = %08lx\n", gettls());
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return 0;
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}
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